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1210212109 is a prime number
BaseRepresentation
bin100100000100010…
…0101111100001101
310010100020010220201
41020020211330031
54434303241414
6320031013501
741663430121
oct11010457415
93110203821
101210212109
115711512a7
1229936a291
1316395b752
14b6a2b581
15713a6574
hex48225f0d

1210212109 has 2 divisors, whose sum is σ = 1210212110. Its totient is φ = 1210212108.

The previous prime is 1210212077. The next prime is 1210212149. The reversal of 1210212109 is 9012120121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 868775625 + 341436484 = 29475^2 + 18478^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210212109 - 25 = 1210212077 is a prime.

It is a super-2 number, since 2×12102121092 = 2929226697540455762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210212149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605106054 + 605106055.

It is an arithmetic number, because the mean of its divisors is an integer number (605106055).

Almost surely, 21210212109 is an apocalyptic number.

It is an amenable number.

1210212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210212109 is an equidigital number, since it uses as much as digits as its factorization.

1210212109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1210212109 is about 34788.1029807605. The cubic root of 1210212109 is about 1065.6644986451.

The spelling of 1210212109 in words is "one billion, two hundred ten million, two hundred twelve thousand, one hundred nine".